Originally Posted by
kenparry
On the B767 we used to use 3% per hour. So your 200lb passenger would result in an extra 6lb per hour fuel burn.
6lb but only for the final hour of the flight, for the next plus last hour 6lb + 3% = 6.18lb, the hour before that 6.18lb + 3% etc. etc. etc.
In my day some said 4% per hour, some said 6% for the first hour then 3% per hour thereafter but certainly with jets we had computerised flight planning to work all this out for us.